Windows 3.1 Device Drivers (ddag31qh.hlp) (Table of Contents; Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Standard-mode Grabber Functions and Structures
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DisableSave      Disables video-context switching
EnableSave       Enables video-context switching
GetBlock         Copies a block of screen data
GetInfo          Return information about the grabber
GetVersion       Returns the grabber version number
InitScreen       Initializes the screen to text mode
InquireGrab      Returns grab buffer size or calls extended function
InquireSave      Returns save buffer size
RestoreScreen    Restores the display context
SaveScreen       Saves the display context
SetSwapDrive     Sets the current swap drive and path
GRABINFO         Grabber Information Structure
GRABREQUEST      Grabber Request Packet Structure
GRABST           Grab Buffer Structure
INFOCONTEXT      Information Context Structure
DEVICECONTEXT    Device Context Structure